6166890F69EA4CA2A6E4B370DC069C51.jpg)
.jpg)
Description
-
BrandAlstom
-
ModelMVAJ34T1DB0753B
-
Product NameMVAJ Series High-Speed Heavy-Duty Circuit Breaker Tripping & Protection Control Relay
-
Country of OriginUnited Kingdom
-
HS Code8536490000
-
Dimensions144 mm×160 mm×72 mm
-
Weight1.23 kg / 2.71 lbs
-
Operating Temperature-5°C ~ +55°C (23°F ~ 131°F)
-
Storage Temperature-40°C ~ +70°C (-40°F ~ 158°F)
-
Power Supply24VDC
-
Warranty12 month
-
Product StatusNew and original
Alstom MVAJ34T1DB0753B Technical Specification Document
Electrical Parameters
Rated Coil Operating Voltage: DC 110V (defined by suffix code 0753B)
Coil Rated Operating Current: 22mA; High burden initial inrush current: 160mA
Operate Action Time: Ultra-fast tripping response ≤ 10 milliseconds
Contact Rated Switching Capacity:
Resistive DC load: 250VDC / 10A; Inductive DC trip coil load: 220VDC / 6A
Burden Mode: High-burden configuration with time-delay economizer circuit, automatically reduce coil current after actuation
Contact Quantity: 34 contact points layout (MVAJ34 series standard specification), combination of normally open / normally closed contacts
Trip Indication Circuit: Built-in mechanical flag + auxiliary signal contact for fault trip status remote feedback
Alstom MVAJ34T1DB0753B Detailed Wiring & Connection Instructions
1. Relay Coil Trip Command Input Wiring
Coil dedicated terminal row X1: Terminal 1 = DC110V positive pole, Terminal 2 = DC 0V negative pole
Trip signal output port of upstream protection relay connects these two terminals; strictly follow positive-negative polarity sequence
Recommended cable specification: 1.5mm² shielded twisted pair wire for long-distance wiring over 20 meters; shielding layer single-end grounded inside relay cabinet
2. Circuit Breaker Trip Coil Load Contact Wiring
Multi-group NO/NC contact terminals located on main terminal block X2, grouped by independent contact loops
Normally open contacts connect breaker trip coil control loop; normally closed contacts apply for protection blocking interlock circuit
Each contact loop external wiring must be matched with fuse according to 6A inductive load rated current for overcurrent protection
3. Mechanical Flag Remote Feedback Signal Wiring
Auxiliary signal terminals X3 are used for transmitting trip flag status signal to DCS/SCADA system
Dry contact passive output mode, no external power supply required for signal transmission
4. Electrical Remote Reset Circuit Wiring
Reset control terminals X4: access external DC control power supply for remote electrical reset of latched trip flag
If only local manual reset is needed, these terminals can be left open-circuit without wiring
Alstom MVAJ34T1DB0753B Core Product Advantages
1. Ultra-Fast Tripping Speed: Action time less than 10ms realizes instant fault isolation, critical for preventing power grid fault expansion and equipment burnout.
2. High-Burden Anti-Interference Technology: Effectively resist capacitive discharge current and leakage interference of long-distance DC tripping cables, avoid false mal-operation caused by wiring stray electricity.
3. High-Capacity Multi-Contact Output: 34 configurable contacts support simultaneous driving of multiple circuit breakers, protection alarm signals and interlock logic loops.
4. Mechanical Trip Indication Flag: Visible mechanical latch flag retains trip status after power failure, convenient for on-site fault troubleshooting without power supply.
5. Plug-in Draw-out Structure: Quick disassembly and replacement without whole cabinet power cut, greatly shorten substation maintenance downtime period.
6. Dual Reset Mode Optional: Supports manual local reset + electrical remote reset, flexible for unattended substation automatic reset requirements.
7. Built-in Delayed Economizer Circuit: Lower continuous coil working current after relay pull-in, reduce long-term heating and extend relay service life.
8. Strict Power-Grade Industrial Reliability: Mass field verification in European power grid systems, ultra-low failure rate under continuous 24-hour operation.
